With only one observed failure, you cannot estimate two model parameters (such as alpha and beta for Weibull). You can perform a WeiBayes analysis if you only need to estimate one of these parameters. Select Weibull as the distribution model at the top in Compare Distributions. Then click the red triangle next to the Parametric Estimate - Weibull for the model results and select Fix Parameter. A new section opens where you can enter the known value and then estimate the other.
Note that you can estimate the independent parameter but you cannot evaluate goodness of fit with only a single observation.