Accepting means you allow yourself to feel whatever it is you are feeling at that moment. It is part of the isness of the Now. You can't argue with what is. Well, you can, but if you do, you suffer.
Feeling will get you closer to the truth of who you are than thinking. I cannot tell you anything that deep within you don't already know. When you have reached a certain stage of inner connectedness, you recognize the truth when you hear it. If you haven't reached that stage yet, the practice of body awareness will bring about the deepening that is necessary.
Acceptance is the embracing of what happens. Acceptance is a way of getting in touch with the deeper, timeless dimension of aware presence, simply through accepting that this is what is happening or this is what I am feeling or thinking.