my new character kennyb3 cannot do anything cause it has a pop up without ok or anything. I would post screenshot if there was a way.

Sounds like part of the initial tutorial, which doesn't let you skip even if you know what you're doing. Follow its instructions until completion.

If you're on a Windows-based PC, you can press the PtSc (Print Screen) button to take a screenshot. On Android, you should be able to press Volume-Down + Power to take a screenshot, though I'm not sure if this is device or Android version specific. I'm using a Samsung Galaxy S8. I'm not sure about iOS or OSX.

If you are on the mission select screen, and it is asking you to choose the first tutorial, make sure your mission filter is set to all or local. If you have it set to Combat or Trade or anything like that, the mission you need to accept wont show up. This is currently a client setting and not a character setting.

Maybe the mission filter should be per character rather than account? This way if you make a new character your mission list for a new character should be set to all and this could not occur. I've only made 2 alts, and this had me confused BOTH times!

So, it was the stage asking him to click on the 'Ship' tab, hence the lack of any OK button.