i missed to accept seat in round 1 of upcet but want to participate in round 2 . how?

Hi Nisha,

Yes you can participate in next rounds.

This the schedule table, please refer to this-

Round 2 of UPSEE 2021 Counselling- Registration and Payment of Fee (Fresh Candidates)	October 21 to 23, 2021
Round 2- Document Verification (for fresh)	October 22 to 24, 2021
Respond to Queries R 2	October 22 to 25, 2021
Document Verification (of responses to Query)	October 22 to 25, 2021
Round 2- Online Choice Locking

October 22 to 25, 2021

Seat Allotment- Round 2

October 26, 2021

Online Willingness (Freeze/Float)

October 27 to 29, 2021

Payment of Seat Confirmation (20000/12000)

October 27 to 29, 2021

Online Withdrawal (Refund 15000/9000)

October 27 to 29, 2021
Physical Reporting of freeze candidates at Institution (Round 1 and Round 2)
October 27 to 29, 2021

Round 3 of UPSEE Counselling 2021- Registration and Payment of Fee (Fresh Candidates)

October 30 to November 1, 2021 (10.00 am)

Round 3- Document Verification

October 30 to November 1, 2021 (12.00 noon)

Respond to Queries R 3

October 30 to November 1, 2021 (2.00 pm) Document Verification (of responses to Query)
October 30 to November 1, 2021 (11.59 pm)

Round 3- Online Choice Locking

October 30 to November 3, 2021

Seat Allotment- Round 3 (All seats will freeze, no float option, no withdrawal/refund permitted)

November 5, 2021 Online Willingness (Freeze/Float)
November 6 to 8, 2021

Payment of Seat Confirmation

November 6 to 8, 2021 Online withdrawal (Refund 10000/6000) November 6 to 8, 2021

Final option for Physical Reporting of freeze candidates at Institution of Round 1, 2, and 3

November 8 to 9, 2021

Round 4 of UPSEE Counselling 2021- Registration and Payment of Fee (Fresh Candidates)

November 9, 2021

Round 4- Document Verification

November 9 to 10, 2021 Respond to Queries R 4 November 9 to 10, 2021 Document Verification (of responses to Query)
November 9 to 10, 2021

Round 4- Online Choice Locking (last option to change the choices, the choices filled will also be treated for further rounds including internal sliding)

November 9 to 11, 2021 Seat Allotment- Round 4 (All seats will freeze, no float option, no withdrawal/refund permitted) November 12, 2021

Payment of Seat Confirmation

November 13 to 14, 2021
Final option for Physical Reporting of freeze candidates at Institution of Round 1, 2, 3, and 4 (in case of non-reporting allotted seat will be deemed as cancelled, no refund will be provided for whatsoever reason) November 15 to 16, 2021
Round 5- Online willingness for internal sliding (only for government institutes, only for physically reported students in government institutes) November 19, 2021
Round 5- Allotment for Internal Sliding in Govt Colleges (if seats remain vacant) November 19, 2021
Round 5- Seat vacancy For Special Round November 19, 2021
Round 6- Registration and Payment of Fee for fresh candidates November 19, 2021
Round 6- Document Verification November 19, 2021
Round 6- Online Choice Locking & Payment of Rs 20000 November 19, 2021
Round 6- Seat Allotment November 20, 2021 Round 7- Registration and Payment of Fee (only if seats remain vacant in government colleges) November 21 to 22, 2021
Round 7-Document Verification November 21 to 22, 2021
Round 7- Online Choice Locking & Payment of Rs 20000 November 21 to 23, 2021
Round 7- Seat Allotment November 23, 2021
Physical reporting of special round 6 and 7
November 24, 2021

For more details, use link - https://engineering.careers360.com/articles/upsee-counselling

Hope this helps.

Good luck