If you have chosen the leave entitlement to be based on leave grade and years of service, you will need to first set up the grade first.
Once you have configured the grades, you can then assign the leave entitlement based on the grades created.
The steps to doing this are:
Step 1: Click on
Step 2: Click on 
Step 3: Click on
Step 4: Select the grade you wish to configure at
Step 5: Enter the days of entitlement accordingly.
Step 6: Click on
button
Related articles:
1. Company Settings
2. Configuring Leave Grade
https://support.justlogin.com/hc/en-us/articles/360028782232-Configuration-Leave-Grade-Express-