IPhone ssh into my own Linux _How to configure IP

[sail456852]

I've been searching on this for a while but found none
I downloaded SSH client app (Serverauditor) on my IPHONE,don't know how to use it connect to my Linux pc using my Router's external IP
I succeeded in sshing into my Linux pc on LAN e.g :(my Linux pc internal IP is 192.168.0.2 ,type command username@192.168.0.2 ,and done)
Now here comes problem:
If I know my router's external IP is 183.69.34.21, and my Linux server with internal IP 192.168.0.2 ,How do I describe my IP in this format :username@IP address?
maybe like this:username@192.168.0.2@186.65.34.21? Just imagining...
So can I anyone here help me out ? newbie to Linux
Here are some attachments may help you to understand what I mean

[JeremyB]

You will likely have to set up port forwarding on your router to route incoming traffic on port 22 to internal IP192.168.0.2 and you would use ssh username@183.69.34.21

Once you think you have port forwarding settings correct, you can check http://www.canyouseeme.org/