You're trying to send to a BKS address instead of BTS according to the picture.
Instead what you need to do is click the withdraw deposit tab and read what it says at the very top. Here is example of what mine says...
"Receiving BTS
In order to receive BTS from another person or from an exchange, simply give them your account name: truthtaco "
That's not my actual account name but I just put something in as an example.
When backing up your openledger account, you just back it up once, store the backup file somewhere safe (preferably in more than one place) and you still need to save your password as well.
RE: How to move BTS from Poloniex to Freedom Ledger - 2 errors at first before learning the correct transfer method