Here are the instructions on how to use 'Source' codes.
Step 1) First, copy the 'Source' code of the graphic you want to use.
Step 2) Click your username and then 'Edit Profile'
Step 3) Click the 'Source' button
Step 4) Paste the code here, then click 'Source' again.
Step 5) Save your presentation, and you're done!
Example: (It doesn't matter which order the codes are in)