First, kudos for the effort. This post should be seen by senior forum members too, as many don't really care much about the way the post, especially when it comes to quoting.
If you want to make changes like readjusting the size of your image link then you can possibly do is to adjust width and height in the link as follows:
[url=https://ibb.co/c3FbZB6][img width=400 height=300]https://i.ibb.co/vqPsTF3/newbie-posting-1.jpg[/img][/url]
I would just like to add that it's not needed to adjust both width and height when resizing images. One is enough and the other value will adjust automatically to preserve iamge ratio. From time to time I see people changing both width and height and that way distorting the image if ratio is not correct.