So this is 1 gallon all grain kit from what I see . That means you need a pot , bag to mash in . You could lessen the bittering hops a bit or toss them in later . The problem is brewing can be overwhelming your first few times . Extract kits are probably better to start . All grain you have to mash at a certain temp and keep it there for an hour . I tend to think new brewers should start out on extract kits and follow the directions to get familiar with it , then start branching out .
If you really want to adjust this one go for it. On fruit beers its normal to add 1 to 1.25# of fruit per gallon. Ive never made a 1 gallon kit so I'm not sure how much beer would be wasted with say 1 #. I don't think you will have enough space in that , which means getting a bigger fermenter or a 2nd one . Tone down the bittering hops , chill the wort , pitch the yeast . Watch the air lock and after 3 days when the bubbling slows add your fruit ( I imagine the bottle opening is small) re attach the air lock and let it sit for 2 weeks . Check your gravity and if completed go ahead and bottle . Here's a link for priming
https://www.northernbrewer.com/pages/priming-sugar-calculator
Also check out the 1 gallon brew thread.