Importing into Task Module / Nothing Imported into the Contact Name or Related to fields

Importing into Task Module / Nothing Imported into the Contact Name or Related to fields

I successfully imported account and contact records into the Account and Contact Modules.  I then imported task records into the Task Module but nothing imported into the Contact Name field even though I had values in the csv file that matched the Contact Name field in the Contact Module.  So now I have a bunch of Tasks that aren't connected to anything.

I'm also wondering about the "Related to" field.  Can I relate these to the Account records?  I tried to import the Account Names just like the Contact Names but nothing got imported here either.

Any ideas?