Questions about preseed

Megan • TTC baby #1

OK so I bought preseed for the first time this month. And I read the instructions but I have a few questions and I know some of these might make me sound dumb but can you put too much in? Or not enough? How do you know how much your body can hold? If putting to much or too little in will that affect the sperm in anyway? How far into you do you put the applicator? Is it the same distance as you would a tampon or should you it in farther or less? Any insight would be very helpful thank you in advance