Check to see if your company meet the following criterias to be eligible for seamless filing.
Source : ACRA Who needs to file Financial Statement?
FAQ : What if our company is required to file full XBRL ?
Answer : Please revert to your corporate secretary, the current seamless filing is only available for company that fits the criteria to file simplified XBRL
Source : Osome : Filing financial statement in XBRL : Does my company need to do this?
Next, Setup Filer Account.