To edit a file in the prestashop admin area

General information for the website: The problem with the website is that whenever I log in to the admin area,it will just redirect and take me back to the login page.if it manages to get to the admin area,after some few seconds or minutes it would redirect back to the login page,please I want an experience person to quickly come on board and help me correct this problem.Thank you Description of every page/module: The problem with the website is that whenever I log in to the admin area,it will just redirect and take me back to the login page.if it manages to get to the admin area,after some few seconds or minutes it would redirect back to the login page,please I want an experience person to quickly come on board and help me correct this problem.Thank you Description of requirements/features: The problem with the website is that whenever I log in to the admin area,it will just redirect and take me back to the login page.if it manages to get to the admin area,after some few seconds or minutes it would redirect back to the login page,please I want an experience person to quickly come on board and help me correct this problem.Thank you CMS and Admin requirements: The problem with the website is that whenever I log in to the admin area,it will just redirect and take me back to the login page.if it manages to get to the admin area,after some few seconds or minutes it would redirect back to the login page,please I want an experience person to quickly come on board and help me correct this problem.Thank you Specific technologies required: prestashop backend and front end knowledge,advanced php Extra notes: