Hello everyone my names Darryl I’m a 26 year old male from the uk looking to gain 20 kg

Hi, Darryl, and welcome!

Most of the "want to gain weight" information (and people with those goals) is in this part of the MFP Community:

https://community.myfitnesspal.com/en/categories/goal-gaining-weight

If you look in the "Most Helpful Posts" heading there, you'll find posts that others have found helpful, such as these:

http://community.myfitnesspal.com/en/discussion/10326769/are-you-a-hard-gainer-please-read#latest
http://community.myfitnesspal.com/en/discussion/10332083/which-lifting-program-is-the-best-for-you/p1

Best wishes!

#1- Learn safe lifting techniques from an experienced person.
#2- Did you learn safe technique? Have someone critique you in person.
#3- now read below...

Lift HEAVY weight 6-8 reps per set for 3 sets.
Rest 30 seconds between each set. It should be HARD to complete the sets. If not, raise weight.
Eat 2g of protein for each kg of body weight.
Sleep enough.
Cut down or quit alcohol. It turns off muscle growth.