How do you conjugate saber in the present tense? (Spanish)

see below

Regular in Spanish (ending in ER or IR) are conjugated in the tense as follows:

1st person singular -- o 2nd person singular - es ( tu sabes) 3rd person singular -- e (el/ella/Usted sabe)

1st person plural -- emos ( nosotros sabemos) 2nd person plural --- eis ( vosotros sabeis) 3rd person plural --- en ( ellos/ellas/Ustedes saben)

However, saber is irregular in the 1st person singular.

Instead of "sabo", it becomes "se".

Saber means "to know".

I don't know translated in Spanish would be

Yo no se or simply No se .