Update Opportunity field if blank with related Account field

Hello guys,

I am still new into the flow creations and got into challenge I cannot over come.

I would like to have CMP App/Web picklist field updated on the Opportunity upon creation/update, by the related Account CMP App/Web picklist field. 

I know it is something related to that Record-Account Id, but I am not sure what I am doing wrong, but this is what I am getting:

 Thanks in advance