Remove quotation mark

To hide quotation mark you need to go in style.css and find below class
.client-description:before{display:none;}

then just add display none rule in the same class.

This rule will hide quotation mark. And if you want to align text to left then find this below class in the style.css and make text indent value 0px like below.

.client-description > p {
text-indent: 0px;
}