This may be part of giving your blog a home-page, controlling how your blog looks on mobile devices, or various other tweaks.
Luckily this is very simple.
How to find the id-code for any gadget:
"gadget", "widget", and even "page-element" all mean the same thing. I generally use "gadget", because the Page Elements tab currently says "Add a Gadget". But they're absolutely the same.
Add the gadget to your blog in the usual way.
Edit it again, but don't make any changes to it.
Maximise the window, so you can see the very end of the address bar in the window - at the top of the screen.
Note the word there, entering in a number. This is the Gadget-id.
In this example, it's Text1, Other possible values are HTML1, Attribution1, Followers1, etc.
What does the number mean?
The digits at the end of the widget-id show to the number of times that a gadget of this type has been added to the blog: in a complicated situtation, with lots of gadgets of the same type, it can get into double, or even treble-figures.)Related Articles:
Controlling what goes on the homepage
Adding a gadget / widget / page-element to your blog
Editing your blogger template
Putting a gadget on your static-pages only - or your home page
