[Plugin: easyReservations] Taxs

Hi how are you doing i just intall the software and its amazing great job but i have few questions maybe some one can help me and tell me how to set it up
Q 1 How can i add a new filed for taxs?
Q 2 How can i set a new prices for deffrant time?

thank you
Danny

http://ww.wp.xz.cn/extend/plugins/easyreservations/