Image & text issue


I don’t understand why I can’t change the third slider images on my website.
Also, I can’t add an opaque background to allow a better readability of the text.

Also, the text on the left side (below the logo) is always underlined, I do not understand why and I would like to remove it. I tried several ways but still can’t understand where it does come from.

best regards

Here is my site Read-Only: