For Tiki support, please use the forums.
If you are migrating to Tiki5 from Tiki versions earlier than Tiki4, you are encouraged to read first the pages describing the changes introduced in earlier versions of Tiki, such as:
as well as the page linking to the resources related with Upgrades
If this is your first installation ever of Tiki, welcome to Tiki Community! You'll find details about the installation here:
See ReleaseNotes5.1 for prior information.
If you are upgrading from previous tiki versions, and you have never done this before, please follow once the 3 steps documented here: http://doc.tiki.org/Upgrade#Fix_the_encoding_issue