In order for an Investor to perform a transaction, they must have a wallet assigned for the transfer to take place.
If your "Address" field is empty, it is likely that you just create the Investor. If this happens:
1) Return to the "Investors" tab (Top-right > Account > Investors)
2) Click on the "green edit button"
3) Hit "Save"
4) If the address is still empty, repeat steps 2-3.