If you are an Admin user for the eSourcing Company you will be able to assign eSourcing services to a colleague that is registered in Metro Link Plus but do not have eSourcing access. 

Click on the down arrow next to your name on the top right and select ‘Portal Management’

You will see a list of all user for that company

Click on the gear icon on the right of the user you want to give access to. 

Select 'eSourcing' and click 'Add Supplier'. 

The new user will see the eSourcing icon in his MLP Home page and will be able to access the application.