Please do not post the same thing multiple times. The board software automatically flags certain posts as needing moderator attention. This happens the most often for new users. I'm pretty sure this is made clear at the time you attempt to post. Posting the same thing over and over again just makes that many more posts the moderators have to weed through later. This makes us sad. Don't make us sad. If your post/thread doesn't appear, just wait a while. Don't post it again. If it hasn't shown up by the next day, then you can try again. I normally go through posts in the mornings, and try to check a few times throughout the day, but I'm not here 24/7. There will typically be a significant delay before posts are approved. Just be patient.
the error is pretty simple actually. in that line you call the NSString method StringWithString:, which takes one argument. You are trying to pass it two when at the end of the first string you have , imageName. That is where you are passing two parameters to a method that only takes one. You need to combine that string and imageName in a previous line. Don't try to do everything on the same line, it makes code very difficult to read/maintain and you get weird errors like this.
EDIT: appdesignify's method is smarter, use StringWithFormat. But still don't try to do everything on one line.