The journal “European Educational Research Journal” is a so-called hybrid journal. Meaning that they publish according to the subscription-based model (publishing for free and only accessible for those with a license or willingness to buy the paper). You can choose the option for open access, and you ‘normally’ need to pay a fee (see for APC’s enclosed file).
If your country is listed in the so-called Research4Life list ( https://www.research4life.org/access/eligibility/ ) then you are eligible for a discount or possibly a waiver to publish free of charge https://journals.sagepub.com/author-instructions/EER#OpenAccess