It is written that I don't have any upwork hours, allthough I have completed one task allready at "upwork". I've completed it for 30 % and was paid for it. So I guess I should have some "hours". Can this be solved?
What do you mean by: I've completed it for 30 % and was paid for it?
Upwork works with official fixed and hourly price contracts. You need to be hired on a hourly contract > track your time with the app.
Please read this help articles to learn more how our hourly contracts and fixed price contracts works.
Only time spent on hourly contracts count towards Upwork hours.
Time spent working on fixed rate contracts does not. So, if you want to increase your Upwork hours you have to work some hourly contract(s)