read all the terms and condition as they mention after that in website and agree / disagree with them.
fill the form, enter your surname and given name. enter your passport details. your date of birth. you mobile number email id, residence address etc. and also attached your passport copy which is the only travel document required for visa. your passport should be valid at-least 6 month before travel date. other wise it can be issue while traveling. its better or for safe side you can renew your passport first.
demonstration image is attached as below
they will send you verification link to your email Id and you need to read carefully and confirm through your email id.
see attached the image below as a reference.