If you are using the free assets, you should attribute the contributor when using our assets.
Please read the below instructions for the attribution.
Example of attribution:
In this link when you click on any format to download icons, you will get the popup like this,
You need to copy this text to give attribution to the contributor.
Avoid Handshake Icon by Graphic Mall
There are different cases where you need to add credit to the contributor, please refer below mentioned cases.
Insert the attribution on the page where the icon is shown. This can be placed next to the assets or on the footer of the website.
Print the attribution on the final printed product.
Put the attribution on the credits/description page of the application.
Put the attribution in the text description of the image.