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When I try to type something new in the source code, nothing happens

When I try to type something new in the source code, nothing happens | Can someone tell me how to use inspect element; I already found out how to open the source code of the page, but it doesn't let me edit it | image tagged in falstaff plush | made w/ Imgflip meme maker
90 views 3 upvotes Made by Falstaff. 3 weeks ago in MS_memer_group
Falstaff plush memeCaption this Meme
5 Comments
1 up, 3w,
1 reply
just type
1 up, 3w
It doesn't let me
I try to, but the code doesn't change
1 up, 3w
idk im at school
0 ups, 3d
right click
edit as html
0 ups, 3w
Falstaff plush memeCaption this Meme
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Can someone tell me how to use inspect element; I already found out how to open the source code of the page, but it doesn't let me edit it