Forum:Please tell my why this happens

i sign when i create a new article and comment on others, but it keeps telling me to sign even though i do. why does it happen? signature: get teh pikachu for meh! ive been banned from scratch! halp meh! Gime me a Mewtwo! 17:36, 12 August 2014 (EDT)
 * That is not an appropriate signature. According to SIG, your signature must display and link to your username and it must not be long. ZeldaStarfoxfan2164 (talk) is bad for me 17:47, 12 August 2014 (EDT)
 * Also, use talk pages for questions like this. Creating forum threads for something like this is wasting space. Berrenta (talk) 17:50, 12 August 2014 (EDT)