Heh, no problem at al~! Ah, Welcome to DeviantART~!
Oh, to submit into a group? Well, firstly you have to find a group page, mostly just by searching art and what they have submitted to them should be on the side bar. The most appropriate group for your piece would be a VOCALOID group, like this one- [link] Once your on the page, just become a member, and shortly after the group should approve. When you've done that, it should be easy, all you do is click "Contribute art", chose a picture of yours to submit, and then they will either approve or disaprove (Dissaprove only generally occurs when you put it into the wrong folder, i sugest you check the top left corner to see if it's submitted in the right place)
... Erm, from what i've seen, you've figured it out, haven't you? O///O I'm sorry for the late reply... And dont worry, your english is great~