Trigger keys, followed by the start of an emoji name, are used to activate Rocket. For example ":wave" uses the trigger key ":". Rocket expects trigger keys to be a single punctuation mark. I've found that ":", "(", and "+" work best.
Adding custom gifs
Custom gifs and images can be added to Rocket once it has been licensed.
After you purchase Rocket, you will be emailed a link to download a collection of gifs. Download the zip file from the link.
Extract the contents of the zip file
Move the newly-created folder to a permanent location, for example in your Pictures folder. Rocket reads these files off your computer when operating.
Open Rocket's Browse & Search window via the menu bar icon, click the plus icon, and select gifs. Then click Add, and locate the folder you downloaded and extracted in the previous step.
You can add multiple files to Rocket with Command-A or by shift-clicking on the first and last file to select all files in the folder.
Click Add to add the files to Rocket's shortcut list
Your gifs should now be available—take a look around using the browser!
If you have any questions or issues, please contact me.