1. Select Administration or Reports 
2. Click ReportSetup...
3. Click ReportViews
4. Click Create custom report
5. Click Drop your files here or click to select them
6. Select the parameters of the report depending on your needs.
7. Click Save

• You can find a list of custom reports on the Geotab Marketplace
• You can also upload reports that you've edited/made yourself custom using these steps.

Reference Articles:

• How to set up a Dashboard Report?
• MyGeotab: How to set up an email report