Fix OSC Mobile Log In

I need a skilled developer to fix a mobile login issue on my OSCommerce site, which is integrated with WordPress. The site currently has a working desktop login but the mobile login has stopped functioning.

Requirements:
- Fix mobile login issue (currently non-functional on iOS devices).
- Add a functioning logout button to mobile view (located on the top navigation bar).
- Work must be tested on a staged version before going live.

Ideal Skills and Experience:
- Proficiency in OSCommerce, WordPress, and WooCommerce.
- Strong experience with mobile site functionality and troubleshooting.
- Familiarity with staging environments for testing.
- Ability to handle additional WordPress and WooCommerce tasks in the future.

Please ensure your solution is mobile-responsive and thoroughly tested.