how do i conjugate the verbs?
verbs like ir , vivir, poder, preferir
2 Answers
The simplest way is to look up each verb using the conjugation tab, choosing the appropriate mood and tense that you want to use, select the correct person (or subject pronoun) and the appropiate form is displayed.
For example, the verb Ir.

Other than that you, you need to provide more information like which mood, tense, and person that you are seeking.
Conjuguemos.com
This is a site that will allow you to repetitively conjugate verbs. There is also a timer available and you are also provided with a grade so you may track how well you are progressing.