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Hardware Version : Not Clear

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Hey TP-Link,I am struggling like hell for having my ports forwarded in order to access online gaming,but have been failing.At first,I had my Reliance 3G Data Card to access the Internet,and after reading a lot of stuff,I realized that Port forwarding would'nt be possible without a router.So,I bought the TP-Link TL-MR3420 yesterday,after a lot of pocket savings,and still my condition hasn't changed a bit.I changed my dynamic IP to a static one,which is essential I guess for port forwarding.But,the Default getway and IP address are same on Routers Status page,and they are not same as the static IP I set to.
I have forwarded the ports on the routers page to my Static IP,but nothing helps.I dont understand specifically to which IP should I get my ports forwarded to.And when I try to port forward to the IP address from my Routers status page,it shows an Error:26106 The IP address is not in the same subnet with LAN IP address.Really,this has been very killing for me.Please please help me somebody,I really will be helpful to you.If I dont get port forwarding ppossible,I have to Unwillingly return this beautiful product within 7 days,since I bought this only for the purpose of Online Gaming.Thank you for reading my problem patiently!