1. Clean the browser from unwanted extensions (or disable extensions that block content)
2. Enable pop-UPS in browser
3. Try a different browser
4. Disable time antivirus software (can block pop-up window with login)
Be sure your Steam Account can accept Trade Offers!
Attention! Payments could be delayed for 5-10 minutes! Be aware that when you deposit money using skins, your balance will receive the sum that was mentioned in the order.