First of all, I have to say that I have never seen "KB1" written in a pattern before. It should be written as K1Tbl (k 1 through back loop) since it can be confused with K1B (knit one below).
This is how I would make [p1,yon,K1TBL] all into YF of previous row, p1.
P 1 into the yf st of a row below (or the one currently on your left needle), don't slip it off the needle yet, bring yarn over the right needle and knit into the back of the same st, then slip all sts off the left needle at once, you'll have 3 sts total, then p1.
I hope this help. Let me know if you're still not sure of how to do it. I will try to make a video for you.
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