If you mean becoming a reviewer through ABCD Index, the process is fairly straightforward: 

Create a reviewer profile on the ABCD Index platform. The registration form asks for basic details such as your name, email, country, mobile number, and research information

Complete your academic profile with your research areas, publications, books, affiliation, and other relevant achievements. These details help editors assess your expertise

If you are interested in reviewing for our journals, please join

Join as Editorial Board Member Click Link -  https://abcdindex.com/register_reviewer.php 

Meet the expected qualifications. ABCD Index says reviewers generally have a PhD/doctorate and research contributions such as publications; academic or research experience is also relevant

Wait for profile validation/selection. Once your profile is approved as a reviewer, review opportunities can be provided according to your research area