Bootstrap BEdita frontend from http://getbootstrap.com
a. Clone boostrap frontend (or copy downloaded zip) into frontends folder inside bedita root folder (like /var/www/bedita/frontends), so:
cd /var/www/bedita/frontends
git clone https://github.com/bedita/bootstrap.git
b. Copy bootstrap/webroot/index.php.sample to bootstrap/webroot/index.php.
c. Copy bootstrap/config/core.php.sample to bootstrap/config/core.php and modify it, if necessary...
d. Set write permissions for temporary folder bootstrap/tmp. For example, in a unix shell, assuming 'john' is the username and current path is frontends folder:
sudo chown -R john:www-data bootstrap/tmp
sudo chmod -R g+w bootstrap/tmp
If something goes wrong take a look at log files (in bootstrap/tmp/logs) and tune your core.php file, changing debug level as needed (bootstrap/config/core.php).
Also read this article: http://docs.bedita.com/setup/if-something-goes-wrong-in-bedita