ロビン

You're amazing! Thanks :)

If "to go" is "行く" why does it switch to "行き"?

In Japanese grammar, verbs change gramatically and dramatically.
For example,　
行かない(do/will not go)
行きます(polite way to say go; 行きたい applies to this)
行くとき(when you go)
行けば(if you go)
行こう(let's go).

This rule is called 五段活用（in English, five-stage conjugation?）

"to want to go" = "行きたい"
"to go" = "行く"

Verbs always change with the use.

Alright! I'm just learning how to express "want."

Thanks for the help from you two! :)

You're welcome（＾－＾）

Could you put up the Italian or English translation when you are writing in japanese? :D