Looking at your stats, I'm going to assume you're talking about Hiragana. It just takes a bit of time. Some people learn them faster, some slower, you'll memorise them eventually :)
Maybe take a look at the mnemonics under each character (usage notes)? That could help. You can also try watching a video lesson (e.g. on YouTube). Having someone walk you through the characters does help. Have you tried writing them down?
