To give a user Access you will need the Capture User Permissions App in Access Evo.
Add the App
Log in to Access Evo as an Organisation administrator.
Open a Dashboard Tab then select Add App.
Add Capture User Permissions.
App should now be on Dashboard
Change Access to Buyers
Go to Capture User Permissions app.
Select user to amend from list and click Edit.
Select Buyers that you want to add to users to.
Click Save.