What information should I add in the profile?

You really need to add as much information as you can. It is recommended for a couple of reasons.  First, it has been shown in multiple studies that professors typically respond to students that actually tell them about themselves. Second, AI and recommender algorithms at Academentory will do their best to find a good match between a position and application.
Do not hesitate to write free text essays and attach documents with your resume or CV, examples of papers, transcripts, and more.