If you wish to get it signed by someone ,you could use the send for signature feature of Acrobat DC.
In case you need to sign it yourself ,you could that by Fill&Sign option.
Once you click on Fill&Sign ,it will give you few options in the toolbar above.You need to click on the Sign option on extreme right and then choose add a signature if you are doing it for the first time.
The next signature box would give you three options to sign your document,either you could draw it or type it or choose an image of your signature and apply it .The signature you would create would be saved so that you could use the same in future.
You could also refer the following link to know more about signing PDF'