First step is to sign up. Squads is an invite-only developer community, so you cannot just join any team. You need to be invited. We will help you with that.
After sign up and initial interview we may introduce you to a fitting team. When teams need your expertise they can also approach you. Bringing new team members to experienced teams gives our customers and new team members the best results.
We cannot make a match immediately for each new sign up. In fact, it typically takes quite some effort to make a good match. Don't give up too easily.