The infinitive is used in Spanish in specific situations, generally when a command is directed to the general public through signs, for example in traffic, in towns, in public areas. It is also used when we are giving step-by-step instructions, for example in a recipe book, or when explaining how to build something.
If it is a negative command, you just place "No" in front of the infinitive. So there is no need to conjugate the verb.
The Spanish infinitive in signs
Here are some examples:
The Spanish infinitive for step-by-step instructions
The use of the infinitive as a command instead of the imperative makes the command a "softer" and more "polite". You will still sometimes find commands directed to the general public in the imperative, but the infinitive seems to be preferred in these cases.
See also Using preposition a + infinitive to express a command in Spanish
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