It sounds like you're running into the common issue on CS.RIN.RU where the "Agree to terms" button is grayed out or unresponsive. Here’s a short review/troubleshooting post you can use or adapt:
Do not spam the Agree button. Clicking "Agree" 50 times in a row will flag your IP as a scripted attack, resulting in a 24-hour hardware ban. cs rin ru can%27t agree to terms
The standoff between RIN RU and their organization has sent shockwaves throughout the CS community. Fans and fellow players have taken to social media to express their support for the team, with many calling for the organization to reconsider their demands. It sounds like you're running into the common issue on CS