If your shoe is untied and you have to tie it because otherwise your shoe will fall of then just do like this...
First, you have to make sure that your shoelaces are pulled tight
If your shoelaces are long, you might want to wrap them around your leg one lap, but if they are not, then you can just skip this step
When you have your laces pulled tight and you feel ready to tie them, take one of the laces and put it first under the other, then over and then under agiain, and then pull hard
Now you have to make a loop with the lace to the right
Wrap the left lace around the loop
Now you have to take the lace you just wrapped around the other, and put it under itself
Now it should lock like this, if it dosen't, just try again untill you succeed!
And finally, pull the two loops at the same time. Now your shoe is tied
The creator of this guide has not included tools