When you are in iMob Online select The Don from the lower task bar, which is in between News and Marked. Here is the primary place where you spend your iMob Online Respect Points, both free Respect Points and those that were purchased. At the top of the screen it will list how many iMob Online Respect Points you currently have and then there will be a number of options for spending your iMob Online Respect Points. Below this will be a number of different iMob Online Respect Points packages that you can buy. They will come in increments of 83, 225, 500, 1425, 2500 and 4000 iMob Online Respect Points, each with their own respective price.
Once you find iMob Online Respect Points package that you want to buy you just press it, which will then link you to that iMob Online Respect Points package page in the App Store. From here, you just buy and download it like you would with any pay application. Once it is downloaded to your iPhone desktop just select it, which will then open up iMob Online with the newly purchased Respect Points intact. Usually you should try to wait for free Respect Points, as The Godfather releases them on a regular basis.