There are different ways in which a person can qualify for a 100% bonus on the first deposit. It varies from operator to operator. Some will ask you to enter a bonus code when registering a new account or making your qualifying deposit. Others will require you to click a link to activate an offer, while others will be applied automatically without you doing anything. There will typically be a minimum deposit you need to make and certain payment methods might be excluded from the offer. You should read the terms and conditions of the bonus deposit 100% to see exactly what you need to do.