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Yes, the management of templates is in the administration area. I would highly recommend using GIJoe's AltSys module as it's a bit easier to make changes with. I've got notes on implementing it in the forums. It makes management, development, and changes to system templates much easier (as well blocks, too).
Let me know if that isn't clear enough.
FYI, in case it's not clear, one of XOOPS' early strengths was its adoption of the presentation layer separated from the functional, computational layer. The data is passed to a Smarty Template and then the data is presented with the HTML in the template using data tags in the template. Even if you don't know Smarty inside and out, it's pretty easy to change what you are looking for if you know HTML, because it's essentially just HTML with some embedded data tags.
Clear as mud?