I would like to create in this form, that is accesible from the outside by a link to read it, so if I send the text, just click to read, such as the forum
If I understand you correctly you want a publically available form.
That is simple, dont put security on that form and you are done…
Or alternatively if you want some security add some checksum stuff to it.
For example make your form react to the parameter.
Say you send a link https://mywebsite/myapp/myform?linkid=1345JJA885
Then grab that linkid, check it and simple react accordingly.