How do I use items from the roleplay items shop section?

[Ungod]

What can I do with them?

[Fyrd Argentus]

Items in the "roleplay" section of the shop are meant to inspire you to develop a character.  They give both ideas and justification for the things that you describe your character doing in chat.  For instance, saying you crash a zeppelin onto the Gazebo of Equilibrium is going to be dismissed by the other players as ridiculous, but if you say "*covers his head with a handkerchief.*" or "*tickles him with her blue parrot feather.*" these things will be believable, and accepted as real by the other players, ESPECIALLY if you actually have a handkerchief or feather in your inventory.  You might also want to work on a collection of things that you fancy, or that define the character you are stepping into.

[Muratus del Mur]

Other RP items can be combined into other usable items, or collected, or help you whenever a role related decision is pending. For example if you wish to build yourself a pub, getting related items that could be used in a pub, makes the big difference compared to someone that just sais he has a pub somewhere, and you will receive official support in roles and events you can organize. 

Items are a warmup for this things you wish to achieve in this realm.