Option 1: Nameservers
Log in to your domain registrar (GoDaddy, Namecheap, Google Domains, etc.) and update your nameservers to point to your hosting provider.
Option 2: A Record
If you prefer, point your domain's A record to your server's IP address. Your hosting provider can give you this.
Update WordPress URLs
Go to Settings → General and update both the "WordPress Address" and "Site Address" fields to your domain (e.g., https://yourdomain.com).
Enable SSL
Enable free SSL through your hosting provider (most offer Let's Encrypt), then make sure your URLs use https://. This is critical for SEO and trust.