There is not enough context to answer your question. I assume you are talking about the speed of a sprite? Is it using goto, or bullet or path or car etc. How is it is getting assigned a speed. If you don't know the context try asking Bard the same question you just posted here : Say using construct 3 how do I--it will help you immediately get some idea of what it (or anyone) is going to need to know to answer your question. Then you can ask it here with probably more success in getting a useful answer.
yours
winkr7