I need help on how to use setup wizard

See D-Link's support-site: ftp://ftp2.dlink.com/PRODUCTS/DWL-2100AP/REVA/

and download the documentation.

To configure the modem properly, you should refer to the user manual. It has all the settings detailed as well as a troubleshooting list:
Link DWL 2100AP user manual

Are you able to enter the setup wizard at all?
Enter 192.168.0.1 in your browser address bar, admin is the username and the password is left blank. Is this what you mean?

D-Link AirPlus Xtreme G DWL-2100AP Wireless Access Point provides speed upto 108Mbps, which is the maximum wireless signal rate derived from IEEE Standard 802.11g specifications. However, the actual speed depends upon the wireless network environment, setup and devices.

For further details please refer to DLink Official Product Description

Here are the steps to reset the access point from D-Link's website:
Please visit http://support.dlink.com/faq/view.asp?prod_id=1600 for complete FAQ and screen shot.

The following reset procedure will completely restore the default settings on the access point including your password.

Step 1 Locate the reset pinhole on the back of the unit.

Step 2 With the access point powered on, press and hold the Reset button.

Step 3 Hold the Reset button for about 10 seconds.

Step 4 Release the Reset button.

Step 5 The device is now at factory defaults.

You can find the complete manual for your wireless access point here:
http://support.dlink.com/products/view.asp?productid=DWL-2100AP

Visit the emulation wizard and simulate settings according to Quick Installation Guide

Try 192.168.0.1 or 192.168.1.1

Yes,If it is all on one network. That is the same IP scheme and Gateway.
Just set up a Home Network and give permission for all the PC's to access your "server"
No need to buy anything, just go into the Control Panel, Network Setup Wizard.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

try going to the website and upgrading your firmware. it should be in the support tab. that may help you

Hi,

complete setup process & user guide

D-Link AirPlus Xtreme G DWL-G132 802.11g/b > User Guide