When you're explaining an idea or action that is important, use the phrase "It's important that I ___" or "It's important that you ___", etc. For example:

It's important that you understand why we're doing it this way.

It's important that our customers be aware of all the changes that we're making.

Notice in the second example that we use "customers be" instead of "customers are". You use the basic form of the verb, which is the version that would appear after "to":

to give > "It's important that they give..."

to have > "It's important that he have..."

to listen > "It's important that she listen..."