Can't Read/Write to External HDD-Permissions Problem

I have external Seagate HDD, formatted as FAT32, connected to Airport Extreme Base Station. I am unable to Read/Write to this Drive because Finder says I "Don't have permissions" to do so.
Following are details that may be important:
1. I was able to read/write to this drive under Leopard but lost the right under Snow Leopard, after upgrade to SL.
2. In Airport Utility, I set up (2) accounts for the External HDD, "Dad" with "Read/Write" access and "Mom" with "Read" access only. I have Guest Account privileges set to "Read Only". It has been this way for (2) years.
3. Under "Get Info" in Finder, the only account listed is "everyone" with "read" permission only (this is same as Guest Acount in Airport Utility). I am unable to add new accounts because I get error message "The account name is not valid" even though I am using the account name that I am logged in under.
4. I can change the Permissions on the "everyone" account (in Finder) by changing the permissions on the "Guest Account" in Airport Utility. When I do this, "everyone" in Finder now has "read/write" access but my two accounts, "Dad" and "Mom still don't show up in Finder.
5. I also upgraded internal HDD to 1Tb and used Restore from Time Machine. I hhad problems with the restore and did new install of Snow Leopard.
Any ideas on how to make Finder show the two accounts I have set up in Airport Utility?

My apologies for bumping this but I still don't have a solution...any help would be greatly appreciated!

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