There are several issues with your question... I do want to help. 1) the remotes varying, 2) the TVs vary 3) There are many remote devices.
Therefore, I'll give the easiest answer I can think of.
When browsing the web from the browser built into the TV you will have to move the pointer using the remote control's four arrow keys into a place, such as a text entry box, that letters can be entered. Once the pointer is in position use the remote control's enter key. If this is done correctly an onscreen keyboard will appear and you move the pointer on the screen using the 4 directional arrows on the remote control to select the letters. When all the letters have been entered use the return key on the remote. If all goes well the letters you've entered will still be in the text entry box of the web browser.
If I have not helped so far, please post the TV model and I can see if I can help.