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I set it up so only administrators can access the admin screen.
Literal
Administration-use screen [to-に] administrator only can-access [as-ように] did.
A web-dev log sentence. 管理用 ('for administration,' 'admin-use') uses the productive ~用 suffix ('for use with X'). 管理用画面 ('admin screen') is a common UI concept — the restricted part of a web app for administrators. 管理者しかアクセスできない ('only administrators can access') uses the exclusive しか~ない pattern ('only X, nothing else'). The ~ようにする pattern ('make it so that X') expresses deliberate arrangement or configuration. In the past tense ~ようにしました = 'made it so that X,' 'set it up so X.' A classic software-configuration log sentence.