To conjugate a regular ER verb such as 'donner' (to give), you must take off the ER ending and you will be left with a stem. Then add the appropraite ending to the stem, depending on who is performing the action.
The regular ER verb endings are:
(I) Je - e
(You) Tu - es
(He/She/It) il/elle/on - e
(we) nous - ons
(you -plural) vous - ez
(they) ils/elles - ent
Example
I give
Verb: donner
1st person present tense - je donne = I give