I like to temporarily paste the URL into the bottom of my post like this... just for the time being.
You will need only part of the URL... the information after the = sign.
Next..highlight the "IOgUdUU_jYc" text in your post.
Then from the "Insert Special Item" drop down box above where you are typing select "Insert: YouTube".
Click the "okay" button to verify. It will add the following tags to the text you had selected (without the spaces):
[ y o u t u b e ] wWW1vpz1ybo [ / y o u t u b e ]
That's it! It'll look like this!