Asking someone to tell you if they don't understand

Hello. I was wondering if you could tell me how to ask someone (m/f) "If you don't understand me, please tell me (or please let me know)." Thank you!

Hi Nadia, My apologies for missing your question! Here is how you would say it: For addressing a male : Law mosh fahemni , 2oli law sama7t / لو مش فاهمني قولي لو سمحت For addressing a female: Law mosh fahmani , 2olili law sama7ti / لو مش فاهماني قوليلي لوسمحتي