Present Perfect: 1) We use the Present Perfect Tense to talk about experiences. It is important if we have done it in our lives or not. It is not important when we did it. e.g. I have been abroad two times. 2) We use the Present Perfect Tense to talk about an action which started in the past and continuous up to now. e.g. I have been a teacher for more than ten years. 3)We also use the Present Perfect Tense to talk about a past action that has the result in the present. e.g. I have lost my wallet. = I don't have it now.

Do you mean to say “How do I use present tense perfectly?” If so, this is my answer: What kind of word, prefix or suffix you add onto a word or sentence sometimes determines which tense you are using. These are called "context clues". For example: I am eating. (Means that you are eating food right now. The added -ing suffix puts the sentence in present tense.) I will eat. (Means that you plan to eat in the future. The added word "will" puts the sentence in future tense.) I have eaten. (Means that you have eaten in the past. The added -en puts the sentence in the past tense.)