Please follow the steps listed below. For a clearer understanding, refer to the attached GIF:

You can also add the vendor for an asset while adding that asset.

  1. Click on Menu bar i.e.uppermost right side of application
  2. Go to Application settings
  3. Click on the Vendor tab
  4. In the form that pops up, enter Vendor Details (vendor name is a mandatory field here) 
  5. Click save Button.