how to turn off private browsing

I am following all the online instructions I can find to turn off private browsing on Firefox - in Privacy and Security by clicking on 'Remember History' for example, and also restarting laptop - but it is not working and I must constantly log back into all my accounts and websites, including my e-mail account. I need assistance with specific and exact instructions how to remove private browsing and explanation why not working what I have already tried. Thank-you for your assistance.