how can i do elective?

First you have to prepare a CV
Second thing, you should see if your medical school is part of GHLO ( Global health learning opportunities) or not, if your medical school is part then, you can apply through it.
see also, if your medical school has any agreement with any US medical school, if not.

then you have to search for medical schools that you can match their requirements and then start preparing you papers.

Elmansora isn't part of GHLO and they don't have any agreement with foreign universities so, its better for you to start searching by yourself for medical schools that you can match their requirements and then start preparing you papers.

That's right and I think Alexandria is going to join GHLO soon!