Learn English – What does “featured event” mean

As you saw with my deleted answer, your sentence is open to different interpretations. Don't be afraid of using more words if it makes your text clearer. Something like this might work:

With this option you can only enter your company name; you cannot enter an active link to your website.

It means " only one options" out of more they presumably have.

BUT: adverb

only, just, simply, merely: St Anton is but a snowball's throw away from Lech. Collins Dictionary