You can donate some decorations for use in your guild Stronghold or Flagship. There are two ways to do this.
You can donate Bind on Use (BoU) decorations to your guild. You must have permission to add items to the Guild Bank and there must be a slot open.
With the item in your inventory (do NOT add it to your own decorations by right clicking on it), open your Guild Bank.
Click on “Decoration Donation” on the lower left side.
Drag the item you want to donate into the box and a pop up will appear.
Click “Yes” and the item will be available for use in your Guild Stronghold or Flagship.
You must already own the item you wish to donate and have Bound it to your own use or have earned the achievement for the Trophy. NOTE: Please see this table for a list and cost of decorations you can purchase for your guild.
Open the Stronghold Management Window on the Menu Bar.
Click “Personal” under “Decorations” on the left side.
A decorations window will open. Use the category selectors to find the mount or pet you want to donate.
On the preview window for the item, click the green button that says “Purchase for Guild:” and the cost.
A confirmation window will pop up. Choose “Confirm” and the item will be available for use in your Guild Stronghold or Flagship.