Path disappears: You missed a part of step 1. In the Layers, Channels, Paths, Undo window, click the "open paths dialog" tab (looks like a bunch of paths). Highlight the path you just made and mouse over to the left of it and click the 1st empty box, an eye will appear there and the path will show up.
For those trying to change the text: After step 2, before step 3, in the text tool window under the tool selections, set the font style, it's size and the letter spacing (a_b). Don't worry about the color, since you'll fill that in later when it's a selection. Next click the Text along Path button. If all the text doesn't fit along the path, hit Ctrl+Z to go back one step, and adjust font size and the letter spacing accordingly. Then hit the Text along Path button again. Rinse and repeat until it looks like you want.
stuck...: To get rid of the green or pink paths and outlines un-click the eye icon in the "open paths dialog" tab in the Layers, channels... window. Then press Ctrl+Shift+A. That should de-select everything. That's all those colored lines where. But don't do it until after you made a new transparent layer (hit Ctrl+L and click on the icon that looks like a piece of paper with the top right corner folded down) and then filled the selection with a color or gradient like you normally would color in a shape. That last bit should help "I think I'm having the same".
Extra Help
Path disappears: You missed a part of step 1. In the Layers, Channels, Paths, Undo window, click the "open paths dialog" tab (looks like a bunch of paths). Highlight the path you just made and mouse over to the left of it and click the 1st empty box, an eye will appear there and the path will show up.
For those trying to change the text: After step 2, before step 3, in the text tool window under the tool selections, set the font style, it's size and the letter spacing (a_b). Don't worry about the color, since you'll fill that in later when it's a selection. Next click the Text along Path button. If all the text doesn't fit along the path, hit Ctrl+Z to go back one step, and adjust font size and the letter spacing accordingly. Then hit the Text along Path button again. Rinse and repeat until it looks like you want.
stuck...: To get rid of the green or pink paths and outlines un-click the eye icon in the "open paths dialog" tab in the Layers, channels... window. Then press Ctrl+Shift+A. That should de-select everything. That's all those colored lines where. But don't do it until after you made a new transparent layer (hit Ctrl+L and click on the icon that looks like a piece of paper with the top right corner folded down) and then filled the selection with a color or gradient like you normally would color in a shape. That last bit should help "I think I'm having the same".