Playing with online computer on lichess

While playing with stockfish on lichess,
I want to add more time to my side(+15 sec) or in other words, I need more time than computer.

How can I do it? It is very hard to defeat stockfish if it is given equal amout of time.

You cannot give yourself time.
That would be referred to as cheating, a breach to Lichess TOS no. 1

I mean that I want more time while playing with computer on lichess. This option should be there while playing against stockfish on lichess. This will help in learning different moves.

With human player, obviously it is not fair.

Hmm... Yes...
Maybe pick a really slow time instead? Like, give yourself 3 hours to move or something or do correspondence?

How can I give myself 3hours?

@Raml12 On the main site there is an option play with computer.

On Lichess.org press play with the computer, then bring the top dial up to 180, the max time
You can also for good measure give yourself 3 min incrediment by bringing the incrediment dial up too.