This website contains so-called cookies. A cookie is a small text file that is stored on your computer and that contains information. There are two types of cookies. One type saves a file permanently on your computer.
The second type of cookie is called session cookie. While you are browsing a page, this cookie is sent between your computer and the server to be able to link information, such as which login name you use. Session cookies are not permanently stored on your computer, but disappear when you close your browser.
By setting your browser, you can avoid receiving cookies. However, this can make the site not work well. How you turn off cookies depends on which browser you use. Read "Help", or the corresponding menu, in your browser for instructions.