Should I wait until new job starts in a few months, or should I set up 401k now?

**Edit--[b][u]I am employed.[/u][/b]

I have been meaning to set up my 401k since January...

...there was something that I didn't understand how to do online..

Anyway, I start a new job in 3 months, should I just wait til I start the new job?

I have a little money in a retirement account from another job that I need to figure out how to get out...

🥴
**Edit--[b][u]I am employed.[/u][/b]