The images have uploaded - but copying/pasting the URLs is a bit of a pain (and some of them are very small)... However in this image I think I can see your problem. You have the two tables in your relationship diagram, but you haven't defined a relationship between them!
To add the relationship (I'm assuming you want Patient_ID to be the key/match field) - from either table drag and drop Patient_ID onto the Patient_ID field of the other table. You should then have a line (with a small [=] in a box in the middle) between the two tables connecting the two Patient_ID fields. If you need to check/edit the relationship details, double-click on the [=].
Ah, I see you posted again because of your problems with the uploads. Thanks, James, for helping!
I had already responded on the original post so I'll tie them together: