How to add information while user creates post

[hoaxcracker (Veer Abheek Singh Manhas)]

Hi,

I want the users to use a particular format while creating a top. How can I add the text as shown in this image below.

[Mittineague]

Hi @hoaxcracker welcome to the forum

Not “instructional modals” but perhaps topic templates would work?

Topic templates for categories and other alternatives

Topic templates are a useful tool to reinforce forum conventions or to guide new users. Category topic templates Some categories might follow a strict pattern. One such example would be a Movies category, wherein you’d like users to start new topics according to a certain template: I saw: insert movie title I think it was worth: how many stars out of 4 stars Review here: To apply this template to all new topics posted in this category, go to a category, click the button and find…

[eextra (Sylwia)]

Good Idea.
What if I would like to create a different message for each category? How do I do this?