I have a wizard subclass with class features set for 2,6, 10 and 14. What else do I need to do? 

I’m afraid that the question is a little vague. Could you maybe please be a little more specific about what’s going on? 

This subclass cannnot be shared because it doesn't have the required levels. 

Not according to homebrew subclass guide. 

If it has stuff at the appropriate levels then you probably have to save the whole subclass again to trigger it to recheck for compliance.

Just a friendly heads up....

You don’t have to publish it to use it. As long as it is in your “collection,” you and everyone else in the same campaigns as you can use it without having to add it. If you just got it written, then I’m guessing that the playtesting and editing might not be done yet?

I only mention it because once it is published then changing it can be a pain in the neck. And if you do changed it after it’s published there can be inconvenient unintended consequences. Nothing horrendous or anything, just potentially super annoying. I Sometimes wait a week or more after I think it’s done before I publish. I didn’t used to, but I wish I had now.