Need help uploading model

[Peterbilt1993]

hello! im in dire need of help here... ive been trying to upload my 3d model to the warehouse.. as soon as click on upload model to warehouse. a box pops up telling me to sign in...well i do that and it stops... doesnt upload.. once before ive gotten as far as to type all my info in for my model as in title, description etc.. and when i went to hit upload. it just stopped working....