trouble logging into to wordpress

Since yesterday, I have been unable to login to wordpress. I tried getting new login password and still nothing. When I enter login name and password, the blanks just go empty. Then I clicked ‘Lost Password’ button and I clicked the link that I received by email
and received the following message:

“Sorry, that key does not appear to be valid.”

Again, I clicked ‘Lost Password’ button.
Now I receive an email link that again sends me to
enter your username and password.