Apple iPod touch "different signal strength routers" Questions

signal strength but, when I clicked on safari it would say not connected to the internet. What worked for me was to go to my routers set up page.(the web address,username and password were on the back

...signal strength, but if i open the itunes store or any other sort of internet connection, it just says either "loading" or "invalid argument" HELP me please!!! :( do the followings ...