Before starting the final render, you have to give to the system some information such as the GPU specifications and the time per frame. You can not do the Render Job without completing this information. The Estimator will ask you for 2 pieces of information: Octanebench Score and Time Per Frame. These informations are for the estimator in the system to make accurate estimates.
You can go to this link again for details.
Info: Estimators are not very reliable. Always make 5-10 frames test rendering before starting the final cloud render, and then move on to the final render stage after specifying your budget according to the result. Never go to the final render stage without doing a test render. Ever.
If you know the Octane Score of GPU(s) in your computer, you can enter to this field. If you do not know, there are 2 ways to find out. First download Octanebench software from this link. After finished download, install and run it. Software will measure the power of your GPU(s) over some pre-made scenes and eventually set a number. This number is your OctaneBench score.
If you do not want to install Octanebench Software on your computer, you can click the "View Results" icon on the same link to see the scores that other users have submitted different results. But here you may not find the GPU config as you want. In such case you may need to install Octanebench Sotware.
tIme per Frame
It is used for estimating how long your scene is rendered on your computer and how much OB/Hours will be spent accordingly.
RENDER YOUR JOB
After these settings are finished, the "Render Job" icon at the bottom will be active. If you okay for everything, you can start cloud render by pressing this icon. Depending on the structure of your scene and the number of frames, render will take a certain amount of time.