Check with your tv manufacture on how to do this.

Some come with the wiring built in. Others don't and need a converter.

First thing to do is to consult the user manual for that TV. Or do an online search for a manual to download for that specific model TV, if you don't have the manual.

Typically both your computer and the TV need an HDMI port available to be able to connect the two devices. Then the HDMI Monitor output specs for the computer need to be compatible with with the TV.

I have an inexpensive Proscan 39" Widescreen LED TV that is less than 2 years old; no problem with installing the HDMI cable, but there is a mismatch between what the TV needs and what my computer (just about 4 years old) will deliver. Plugin the cable and the monitor won't display anything, it's just cuts the signal to the monitor.

What I meant can I connect my tv if i have router and wi-fi?

Yes, if your TV is configured to use a WiFi connection; usually the high end TV's have that type of feature. It would connect thru the WiFi on a laptop /tablet device, but typically desktop computers don't have WiFi.

Bottom line is to consult the user manual for that TV to see what capabilities it has for connecting to other devices.