To manage usage limits, please follow the below steps: 

1. Click on My Account in the top right corner of the home page
2. Navigate to the User Management tab 
3. Click on the user that you would like to update the usage limits on 
4. Click on the User Access tab 
5. The usage is set to the maximum amount by default. If you would like to change this, untick the Max Amount box, this will unlock the user limit field 
6. Add in the limit you want for the user
7. Once you have done this for the relevant products, click Save
8. You will have confirmation that the limits have been updated 

Please note: You will need to have Customer Self Service enabled and have the correct user permissions to do this.