Hello Jyothi,
According to the NEET MDS eligibility criteria for Foreign Nationals, it is not mandatory for foreign nationals to have the temporary registration of DCI at the time of examination. Foreign Nationals can take the exam without DCI registration certificate.
NEET MDS application forms has been released  on October 16, 2018. Go through the link below to check the step by step procedure for filling the application form-

 https://medicine.careers360.com/articles/neet-mds-application-form

Good Luck!

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