Working from the ‘Default’ theme for example, if you open sp-resources/forum-themes/default/templates – then you have a template for every section of the forum. Open spTopicView.php – this template controls the layout and functionality of the topic page where the Answers Topic function is used.
If you have an editor capable of laying stuff out sensibly, scroll down to about line 172 and you should see the functions required for ‘Answers Topic’
If you are referring to this codex article then the page does need updating as it is marked, so the information is not 100% current – but you have lost me when you say you have installed the template functions. It does clearly state ‘If using any supplied themes from Version: 1.2.2 or newer the functions have been included for you’ – so you shouldn’t need to add anything, as I mentioned ‘Default’ themes topic view template and where to find that specific function. It might be worth making sure you have not doubled up by installing this yourself somewhere else.
As for manipulating the function to behave how you want it to, firstly find the function you wish to edit, copy the function name, for example ‘sp_AnswersTopicAnswer’ and paste it into the Codex search. Click the function and you will see a list of arguments that can be applied directly after the function in the template – examples are given on the Codex.
The Answers Topic function is a bit of a complicated one to start with however! Mostly the arguments involve CSS class names so there is not a huge amount you can do with it and it has a few different function calls for different stages of its use.