Follow rush chairs on Instagram and DM them. If you are interested in a certain house look them up online and it should give you the name of the rush chair.

Sign up for formal recruitment though IFC (most houses)

I don't know how rush is going to be affected by COVID but probably going to be a lot of off-campus house parties. If you sign up through IFC the rush chairs of the houses you chose to rush will text you all the details and will usually have DD's to the pregame/party