Commenting and login

I don’t know what version of WP I am using ??

In the last few days when I go to comment I am asked almost all the time (only certain blog sites display my wp account name). to login with my user name and password….I am very careful to type it correctly and sometimes after I do it eg 3 times I get access to make a comment or ‘like’ a post. But just now I tried 4 times and did not get access. Why am I having this problem all of a sudden. My blog is hometogo.wordpress.com My user name is writerwannabe763 Do you need the password that I normally use?

Today to get access to this support I had to register and was given a password I hope is just to ask questions as it is a long complicated password.