Squads on thatsfootball.io are invitation only, so a player with nobody to play with needed somewhere to be seen. The free agent board is that place. List yourself for any mode you have no club in, pick the position you actually play (DM, AM or ST in 3v3; GK as well in 4v4), and add a line about what you are looking for. Captains with a seat open read the board and send an offer straight from it, and your listing clears itself the moment you sign.