Login to InnGenius
Press Admin Tab, click on Rooms (shown below)
Then press the Add button located on the bottom of the screen (shown below)
You can name your Room by number or name (example shown below) Choose the Type of room it will be assigned to such as Single, Double, Twin etc and press OK
Repeat this process for all your rooms. If you need to create rooms from 1 to 50 you can simply type 1..50 in the Room No field and it will list 50 rooms for you.