Shopify Homepage Code Fix

My Shopify homepage needs urgent attention due to non-working custom code. A custom banner or image functionality is broken, specifically a popup intended to collect email addresses.

Requirements:
- Identify and fix the non-working custom code on the homepage
- Ensure the email collection popup functions correctly

Ideal Skills and Experience:
- Proficient in Shopify and Liquid coding
- Experience with custom code implementation and debugging
- Familiarity with Shopify themes and homepage customization

Please provide examples of similar work done and estimated time to complete.