Squarespace Troubleshooting, Domain Connection, and SEO Optimization

I need help with my Squarespace business website. I'm experiencing functionality issues, particularly with access, a domain name connection problem, and needing to update the website. Key tasks include:... (Budget: $15 - $25 AUD, Jobs: HTML, PHP, SEO, Squarespace, Web Design, Web Development, Website Design, Website Development)