If you're trying to access it from a "local" computer meaning another computer on your intranet, then find the intranet ip for that computer. Typically it will be 192.168.1.101 or 101 maybe 102, 103, 104, etc. So, if your router assigns IPs to the 192.168.1.* domain, you can add 192.168.1.% to that list and all computers on you intranet will be able to access the MySQL database.
Note: some routers you might need to add 192.168.10.% or 10.0.0.%, it just depends on how your router assigns internal IPs.
If you're using windows, you can open a command prompt (go to run->"cmd") and type "ipconfig"
Use the first three numbers from the Default Gateway and replace the last with a % sign.
