First answer would be to use the CSS code inside the text like this:
$w("#membertext").html = `<span style="color: blue">${item.description}<span>`
The second answer would be to use the .src link on the dataset like this:
$w("#logo").src = item.src
The third would be using the .link method in the Button itself:
$w("#myButton").link = "http://www.wix.com"