Just buy the camera and router
they have the user manual.
it is not hard for installation.
If you have any not understand,
We are very happy to help you to solve the problem

If you want to use wireless IPcam
you have to buy a wireless router

But take care of the WIFI signal coverage
Because of so many reason, wireless signal may not be cover all area.
But don't worry, you can use wire + wireless together
Wireless IPcam almost have wire function

very easy
1. login to your router and see the DDNS company, then register an account
2. type your DDNS account name and password into router DDNS page
3. Set port-forward in your router to IPcam

If you not understand how to set port-forward
Please advise
1. router model
2. Which ISP
3. IPcam model

試試reboot 過隻router吧
重接火牛就得