the question is unclear, so i will provide answers for multiple variations and you decide if one is helpful.
1. no, chess is a game between two players so you can only challenge one person at a time.
2. yes, just click "start new game" challenge your friend, then go back and click "start new game" again and challenge another.
3. unless there has been an update, there is no way to setup multiple challenges with a single "Start new game" click. you have to do it for each player individually.
4. to get around the difficulty with answer 1., some people have played games in the forums where anyone can make moves against them.
ok, i think i am out of options here.
Is there any way to challenge more than one person at a time?