To upload pictures:
Go to to Settings (top right) --> Your Photos and Albums (Under Gallery Settings on the left) --> Upload Image (it's a button) and then you can select 5 photos at a time to upload from your computer. In the Category box you must select Member's Galleries. Make sure the check box saying you read and agree to the policy is checked and click submit.
To create an album to go My Profile (top right) --> Under Albums create one --> Click Upload Pictures --> Add Files --> Select Files --> Select a file --> Click OK --> Repeat for each file you want --> Click Upload Files --> Click Done to close the pop up --> Click Save Changes to save your photos.
To add your collection to your posts you need to modify your signature:
Settings (top right) --> Edit Signature (from the panel on the left) --> then just type what you want into the edit box and save.
To post pictures you need the URL of the image. Most people upload to another site and link from there but you can link from your gallery here. Use the direct link URL (you can get this towards the bottom of the screen on the right when you are viewing the image). To post them just paste this URL into the popup box you get when you click the little image icon (in between the envelope and film icons).