Is there any performance testing tool for custom GPT before publishing?

I am new to Open AI and this is my first post. Please be kind.
I want to know about how Open AI works for checking or using any tools for custom GPT before publish. I am a Plus account user and have created a GPT(Reminder Assistent (copy)), and also i have introduced a small bug of spelling mistake. Want to know how this bug can be tested or fixed or communicated to developer by Open AI.