Accessing External Links

Hello, good afternoon! I’m having a little problem on my installation. I’m starting to configure multisite now and came across an inconvenience. The system automatically adds the address of my site before any url that I set on the page. For example: I put a picture with link to google.com.br … On this front end is automatically linking to meusite.com.br/google.com.br … You know why this might be happening? The multisite is configured for subdomains … Thanks in advance.