Seaco,
The login/registration on the gallery is different from the main site. Therefore, you have to register again - just to upload to the gallery section.
On the top left side of the gallery page, their is a "login" button - a little below it is "registration" - click on that - and you should follow the instructions.
It's then very simple - and helps you through the proces of uploading. Make sure you pictures meet the rules on dimensions and sizes.
Charley has to approve pictures - he's the only one that can do that - the rest of us mods can't do that. So it's best to tell Charley by PM and he'll normally do them within an hour or two.
Adam