Since you already have an existing wireless network you should be connecting the printer using the "Connection Using an Access Point" where the access point is your existing router.
The other wireless option is "Connection without an Access Point" where the printer communicates with other devices directly - meaning not going through the router.
The printer may see/detect the access point but cannot join your wireless network. That is probably because of a configuration error. The printer must get its assigned IP (dynamic or static) from the router. To do that, the printer must know the router's IP (default is 192.168.0.1) unless you have changed that. The printer must also have the correct SSID and matching security settings for your network.
Use your browser to check the router's configuration. Make sure you know its IP, submasking, DHCP range, security settings, etc. You should not have to make any changes on the router to get the printer to connect unless there is some limit being imposed: e.g., the number of devices permitted to connect at one time.
Wizards are okay but they depend on the existence of certain assumptions about their environment.
Do a reset on the printer to go back to all default settings - that will give you a "clean start" on the configuration.
Then go to the printer's menu's and find the LAN setup screens. There are menus for wireless connectivity. Set up the printer's wireless configuration to match your network.