Can University revoke my degree if I change some results, and how can I correct it? In my research I was asked to edit some conclusions making them more significant at the behest of my adviser. I did what I was asked because I was immature at that time in my thesis work. At that time I didn't know its was wrong.

These changes can't effect the anyone because I only changed the "p value" of the result. I changed a little in an  "ANOVA table" for some result significance. If I put all results without change the "p value", the thesis can also be approved at that time. This all happened because of less knowledge of my adviser on how to tell me to change some results, which now I understand after my work and experience in teaching, but I inserted  all the experimental data accurately in my thesis.

If someone checks my experiment data in "ANOVA" they can find the change in the "ANOVA table" (my mistake). Now I am worring about my thesis and Master degree. If someone complains in future about my thesis, will the University revoke my degree and how I can defend my degree? I worked on machining of some material in my thesis. Can I do something now to correct my thesis?
This is very serious academic misconduct, of the type that reduces the confidence that the public and other scientists are able to have about scientific results. It doesn't matter if you did not change the raw data - you can't expect any readers to actually go through and do this analysis. Therefore, it is the results of the statistical tests, p-values, etc, that truly matter.

You should correct the problem as soon as possible, and beg for forgiveness. If this was done at the instruction of your advisor, that could be grounds for their dismissal from their position regardless of tenure. If you have submitted this work to any peer reviewed publication with these errors, you should inform the editors immediately and submit corrections that include the impacts on interpretation or withdraw the paper entirely.

Your program and your advisor have failed you in their duties if they have made completion of your graduate degree dependent on significant results. You should always design experiments that teach you something regardless of the outcome. Your institution should grant your degree as long as you have done sufficient work; this may be a lengthy, difficult process for you, particularly if you lose support of your advisor for this, but you may not want the support of your advisor if this turns out to be a pattern in their work. Most institutions have staff dedicated to academic misconduct that can assist you in this process.