Assistance please Nba 08 about signing free agent superstar

HI! just want to ask how will i do this, im about to sign a free agent on my team but i it says you have no salary cap space to have this deal go through if we were submit it to the league approval. please contact us again when you have the salary cap space. Ahm sorry i dont have any idea how to do this hehe can you guys teach me how? thanks more power

Go to Wiki section and read about editing the salary cap.

It means that you're over the cap. That's just it.

And if you want to edit the cap, yeah, go to this.