How do I get rid of Trojan viruses?

So I was browsing an adult site, and I got 1 urgent notification message page. I clicked the page and the message said my phone was infected with 6 Trojan viruses. (45.4%) I'm not going to visit those sites no more that's 4 sure. But also, the message said to click ok to get an application that would help me. The application is called vpr proxy Betternet. So my question is, should I add this application? Will it really protect me against people who could get my personal info on Facebook and WhatsApp etc? Hope to hear an answer from someone.