I've seen some people talking about locked items, I was wondering how to do that because my inventory is always full and whenever I want to buy something it always says "YOUR INVENTORY IS TOO FULL CLEAR OUT SOME ITEMS" and it's getting on my nerves. Help!!

Under each item is a little Lock-looking icon. Click on it to lock an item so it cannot be stolen, moved using quickstock, or stolen by the Rotten Rogue. These items remain in your inventory and still count towards how many items you have. If you can't buy from the shops, you may need to clean your inventory. :D Hope that helps.

To add to that. There is a limit of five locked items for normal accounts and ten for gold.

and thanks that does help