You weren't clear whether you needed help making a sparklee or uploading one so I'll do both.
Click the little pictures for a bigger one that you should be able to read so you'll know what I'm talking about.
Type your text where it says 'Text'
Pick a Font - there are lots of different one and they are different sizes
Pick a size - 20 seems to be the lowest
Then move to the right whee you pick text color & back color - this is your banner or background color
After you've clicked the Create Glitter Text button and have one you like, scroll down and copy the Direct Link
Click the 2nd button from the left on the 2nd row above and you should get
in your message.
Paste the link you copied in between the code like shown below.