This is a how to guide for buying tokens on DxSale Presales
You will be then presented by the dashboard where you can click any of the sales that you like such as follows:
Once you click any of the cards you will be greeted by this page.
You should check the minimum or maximum amount of contribution that you are allowed per buy. Then you can put the amount on the Amount text box and click buy. Follow the wallet prompt to complete the transaction on your browser or on your mobile phone.