People need more information about your computer and wireless card to help you.
List your computers make and model. I assume you are using a wired connection right now. So you can run commands. Run the command < lshw > which will give you hardware information, look for network.
Here is mine:
*-network
description: Wireless interface
product: Wireless-AC 9462
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 00
serial: 58:96:1d:2c:15:4b
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=6.0.12-76060012-generic firmware=72.daa05125.0 QuZ-a0-hr-b0-72.u ip=192.168.1.19 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:d3510000-d3513fff
Or you can install install < hardinfo > which will also give you your hardware information with a GUI.
< sudo apt-get install hardinfo > under PCI devices it will again list Network controller and your wireless card. It will appear under Applications>System Tools> as 'System Profiler and Benchmark'.
Include that information here and people will be much more able to help you.