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There are a few quick saved message buttons for transmitting common messages. You can edit these in the settings window. Just be mindful that long messages will take a while to send.
Saved messages have macro-like functionality. These are the macros variables (words that are surrounded by <> characters) that can be used in saved messages which will be replaced when sending the message:
<MYCALL>   - My Callsign
<MYGRID4>  - My 4 digit grid locator
<MYGRID12>  - My extended grid locator up to 12 digits
<MYINFO>    - My Station Information Message
<MYCQ>      - My CQ Message
<MYHB>      - My HB Message
<MYREPLY>   - My Reply Message
<MYSTATUS>  - My Station Status Message
<MYVERSION> - My JS8Call Version
<MYIDLE>    - My Station Idle Time (no keyboard/mouse movement)
<CALL>      - Selected Callsign
<SNR>       - The SNR for the Selected Callsign
<TDELTA>    - The time delta for the Selected Callsign
These macros also apply to configured messages like CQ, Reply, INFO, etc.