Create three buttoms in my listbingo joomla site - open to bidding

I have recently issue a classified website using the Joomla Extension LIsbingo. I already bought a template and now need some customization. I would need to create three buttoms to help the seller (actually the person who will use my site to sell his/her items) to sell his/her product. So these buttons are to be set in the back-end and the user of my site shoould be able to select them (Yes/not) as extra-options he/she is offering to possible buyers. I will give you more details later... Thank you