@Birdman u open and write whtever u want. then lets say u are on pc or laptop, u click on "rich editor" and then it shows many things, and then u click on a utube like button, a rectangle having a equilateral triangle inside of it but flipped at 90 degrees.
if u are on phone, u look for a "T" with an cursor icon type thingy, and follow the same steps.
then u just paste the link and click on "insert" and then post reply