Hi,
if you scroll further down
ADVANCED | Firewall & DMS, you will see that your DIR-600L has an IPv4 firewall. Hence for any port forwarding rule you enter you also have to enter corresponding firewall rules. Please disable DMZ and try if the following settings will work:
You further seem to have a dynamically changing global IP address assigned by your ISP to your router's WAN interface. Hence, you may need some DynDNS solution that registers your current public IP address in DNS to be represented by some static name MYGAMINGSERVER.<some dyndns-domain>, in order to enable Internet access via using MYGAMINGSERVER.<some dyndns-domain>:27010, which resolves to <my-current-WAN-IP-address>:27010.
Btw: According to
this the default unturned port is 27015 except you used the -port:27010 option when starting Unturned.exe.
PT