HI @PriyankaM1 ,
Assuming you're using Unity Catalog compute cluster with Dedicated access mode (formerly called single user), to install that library you need to:
- grab maven coordinates -> za.co.absa.cobrix:spark-cobol_2.13:2.8.4
- go to Compute section (1) in Databricks UI and click on your cluster name (2)

- once you're in your cluster setting, click libraries (3) and and install new (4)

- now, on install library screen select Maven (5), provide coordinates (6) and click install button (7)
- after some time you should see that library was installed successfully
