You can only apply for asylum if you are in Finland
You need to be within the Finnish territory when you apply for asylum in Finland. You cannot apply for asylum for example by sending a letter or an e-mail to the Finnish Immigration Service. It is also impossible to apply for asylum at a Finnish mission (embassy or consulate) located outside Finland.
There is no application form that you can use to apply for asylum in advance. The only way to apply for asylum is to talk to a police or a border control official in Finland.
You can watch videos about applying for asylum on the YouTube channel of the Finnish Immigration Service. The videos are available in Finnish, English, Arabic, Dari, Persian, Somali, Turkish and Russian.
If some other EU Member State is responsible for processing the application, the application will not be processed in Finland. The applicant will be refused entry and sent to the Member State responsible for examining the application.