Add a new video track above your current footage. On that track add your text and it will appear over top of your video footage. You can move it to where you want using the pan/crop icon (it is on the right hand side of the text event itself or you should be able to right click and get to it if you can’t pick it out).
And for future reference, Vegas builds layers in such a way that the topmost layer will always be seen. So, if you want something seen and not hidden behind something else, just put it on top in another track. I do believe though that your version of vegas is limited to 3 video track layers.
j razz
https://www.jrazzcreations.com