Pick-up without contact
If everything you need to pick up is on-site and nothing else is needed, you can just pick up the items and mark the job as completed. Many times direct contact with the advertiser is not necessary.
Code for door and other info
If you have been selected as a helper and the advertiser has usually provided the info needed in the ad. Check for any extra information that may have been added after you were selected.
Use the chat
If you need to contact the advertiser - perhaps to gain access to a property or clarify something - use the chat function in the app. It's there to make communication easy and smooth.
If contact fails
If you are not able to reach the advertiser, and it is necessary for the collection, then unfortunately you will have to cancel the assignment.