In X3 draw your path, then your text, then go under text menu and fit-text-to-path, grap your text and drag it to your path, you will notice when it is centered as there will be a red line in the middle of the text. Once you place the text you may have to mirror or flip the text to make it appear correctly from left to right. If you look at the beginning of the text you will notice a little red diamond, grab that and it will allow you to drag the text in or out to move it off of your path. Then if you need to adjust your kerning just grab your node tool and you will see two arrows one pointing down and the other pointing to the right, just click and drag. Hope this helps