How can I switch from http to https?
Ask your hosting provider how to enable SSL/https on your server for your domain and, if you use a subdomain, also for your subdomain.
After you have done this, you need to change 2 variables in the FamilyTreePHP database. This can be done via PhpMyAdmin.
Go to the table ‘ftphp__cf’ (where ‘ftphp__’ is your database prefix; it might be different in your case) and find the 2 rows where ‘constant’ are ‘CF_BASE’ and ‘CF_BASE_PATH’.
For these rows change ‘value’ from ‘http://…’ to ‘https://…’. Make sure you only add the ‘s’ and leave the rest as it is, otherwise you might break your site!
That is all.