How to upgrade jira plugin from 7.2.2 to 7.3.2

I am very new to jira plugin development , I have jira plugin that support jira 7.2.2 . I want to upgrade that one to 7.3.2 . Please help me how to start this

It all depends on what the add-on does. Read over the Preparing for JIRA 7.3 at and see if anything there jumps out at you as something that might be applicable to what you’re doing.

Even if there isn’t anything - start a JIRA 7.3 instance and test the add-on. More than likely it will work (there are cases though where it won’t and it won’t be documented in the above url).